`1.` Because it can help to increase your strength and energy, giving you a stronger heart. 

`-` Dẫn chứng: Along with jogging and swimming, cycling is the best all-round forms of exercise. It can help to increase your strength and energy, giving you a stronger heart. 

`2.` Because it they don't carry the weight of their body on them feet when cycling.

`-` Dẫn chứng: You don't carry the weight of your body on your feet when cycling. It is also a good form for people with a pain in your feet or your back. 

`3.` If you do too quickly, you can have bad effects.

`-` Dẫn chứng: Doing too quickly can have bad effects.

`4.` You should go cycling twice or three times a week.

`-` Dẫn chứng: You should cycle twice or three times a week.

`5.` If you find you are in pain, you will stop and take a rest.

`-` Dẫn chứng: If you find you are in pain, you will stop and take a rest.

Answer:

1. Because it can help to increase your strength and energy, giving you a stronger heart.

- Dẫn chứng: Câu 1,2: Along with jogging and swimming, cycling is the best all-round forms of exercise. It can help to increase your strength and energy, giving you a stronger heart.

2. Because they don't carry the weight of your body on your feet when cycling.

- Dẫn chứng: Câu 3,4: You don't carry the weight of your body on your feet when cycling. It is also a good form for people with a pain in your feet or your back. 

3. If you do too quickly, you can have bad effects.

- Dẫn chứng: Câu 6: Doing too quickly can have bad effects.

4. You should go cycling twice or three times a week.

- Dẫn chứng: Câu 7: You should cycle twice or three times a week.

5. If you find you are in pain, you will stop and take a rest.

- Dẫn chứng: Câu cuối cùng: If you find you are in pain, you will stop and take a rest.

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